{"id":8443,"date":"2024-03-14T08:08:01","date_gmt":"2024-03-14T08:08:01","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-in-mybatis-to-check-if-a-collection-is-empty\/"},"modified":"2025-08-03T04:57:56","modified_gmt":"2025-08-03T04:57:56","slug":"what-is-the-method-in-mybatis-to-check-if-a-collection-is-empty","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-in-mybatis-to-check-if-a-collection-is-empty\/","title":{"rendered":"MyBatis: Check Collection Empty"},"content":{"rendered":"<p>In MyBatis, you can use the isEmpty() function in the OGNL expression language to check if a collection is empty.<\/p>\n<p>For example, in MyBatis&#8217;s select statement, you can check if a collection is empty like this:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">select<\/span> <span class=\"hljs-attr\">id<\/span>=<span class=\"hljs-string\">\"selectUsers\"<\/span> <span class=\"hljs-attr\">resultMap<\/span>=<span class=\"hljs-string\">\"userResultMap\"<\/span>&gt;<\/span>\r\n    SELECT * FROM users\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">where<\/span>&gt;<\/span>\r\n        <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">if<\/span> <span class=\"hljs-attr\">test<\/span>=<span class=\"hljs-string\">\"userIds != null and !userIds.isEmpty()\"<\/span>&gt;<\/span>\r\n            AND user_id IN\r\n            <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">foreach<\/span> <span class=\"hljs-attr\">collection<\/span>=<span class=\"hljs-string\">\"userIds\"<\/span> <span class=\"hljs-attr\">item<\/span>=<span class=\"hljs-string\">\"userId\"<\/span> <span class=\"hljs-attr\">open<\/span>=<span class=\"hljs-string\">\"(\"<\/span> <span class=\"hljs-attr\">close<\/span>=<span class=\"hljs-string\">\")\"<\/span> <span class=\"hljs-attr\">separator<\/span>=<span class=\"hljs-string\">\",\"<\/span>&gt;<\/span>\r\n                #{userId}\r\n            <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">foreach<\/span>&gt;<\/span>\r\n        <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">if<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">where<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">select<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<p>In the example given above, userIDs is a parameter of type List. We use the isEmpty() function to check if it is empty, and if it is not empty, we execute the corresponding SQL statement.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In MyBatis, you can use the isEmpty() function in the OGNL expression language to check if a collection is empty. For example, in MyBatis&#8217;s select statement, you can check if a collection is empty like this: &lt;select id=&#8221;selectUsers&#8221; resultMap=&#8221;userResultMap&#8221;&gt; SELECT * FROM users &lt;where&gt; &lt;if test=&#8221;userIds != null and !userIds.isEmpty()&#8221;&gt; AND user_id IN &lt;foreach collection=&#8221;userIds&#8221; [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[536,11378,1459,11379,3134],"class_list":["post-8443","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-collections","tag-isempty","tag-mybatis","tag-ognl","tag-sql-mapping"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MyBatis: Check Collection Empty - 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